$90/144: Kernal I/O Status Word ST
+-------+---------------------------------+
| Bit 7 | 1 = Device not present (S) |
| | 1 = End of Tape (T) |
| Bit 6 | 1 = End of File (S+T) |
| Bit 5 | 1 = Checksum error (T) |
| Bit 4 | 1 = Different error (T) |
| Bit 3 | 1 = Too many bytes (T) |
| Bit 2 | 1 = Too few bytes (T) |
| Bit 1 | 1 = Timeout Read (S) |
| Bit 0 | 1 = Timeout Write (S) |
+-------+---------------------------------+
(S) = Serial bus, (T) = Tape
Kernal-Reference:
AND $90 : $F4F5
BIT $90 : $EE79 $F249 $F28A $F524
LDA $90 : $F1AD $F3ED $F4DA $F505 $F55D $FE1A
ORA $90 : $FE1C
STA $90 : $F311 $F3DF $F4A9 $F4F7 $F843 $FE1E
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